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Goodwill and Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Summary of core deposit intangibles and other intangibles For core deposit intangibles and other intangibles, changes in the gross carrying amount, accumulated amortization, and net book value were as follows:
 
2018
 
2017
 
2016
 
($ in Thousands)
Core deposit intangibles
 
 
 
 
 
Gross carrying amount
$
58,100

 
$
4,385

 
$
4,385

Accumulated amortization
(5,326
)
 
(4,385
)
 
(4,273
)
Net book value
$
52,774

 
$
—

 
$
112

Additions during the period
$
58,100

 
$
—

 
$
—

Amortization during the year
$
5,326

 
$
112

 
$
281

Other intangibles
 
 
 
 
 
Gross carrying amount
$
44,931

 
$
34,572

 
$
32,410

Reductions due to sale
(43
)
 
—

 
—

Accumulated amortization
(21,825
)
 
(18,992
)
 
(17,145
)
Net book value
$
23,062

 
$
15,580

 
$
15,265

Additions during the period
$
10,359

 
$
2,162

 
$
1,012

Amortization during the year
$
2,833

 
$
1,847

 
$
1,812
Summary of changes in balance of mortgage servicing rights asset and mortgage servicing rights valuation allowance A summary of changes in the balance of the mortgage servicing rights asset and the mortgage servicing rights valuation allowance is as follows:
 
2018
 
2017
 
2016
 
($ in Thousands)
Mortgage servicing rights
 
 
Mortgage servicing rights at beginning of year
$
59,168

 
$
62,085

 
$
62,150

Additions from acquisition
8,136

 
—

 
—

Additions
10,722

 
7,167

 
12,262

Amortization
(9,594
)
 
(10,084
)
 
(12,327
)
Mortgage servicing rights at end of year
$
68,433

 
$
59,168

 
$
62,085

Valuation allowance at beginning of year
(784
)
 
(609
)
 
(809
)
(Additions) recoveries, net
545

 
(175
)
 
200

Valuation allowance at end of year
(239
)
 
(784
)
 
(609
)
Mortgage servicing rights, net
$
68,193

 
$
58,384

 
$
61,476

Fair value of mortgage servicing rights
$
81,012

 
$
64,387

 
$
73,149

Portfolio of residential mortgage loans serviced for others (“servicing portfolio”)
$
8,600,983

 
$
7,646,846

 
$
7,974,742

Mortgage servicing rights, net to servicing portfolio
0.79
%
 
0.76
%
 
0.77
%
Mortgage servicing rights expense (a)
$
9,049

 
$
10,259

 
$
12,127


(a)
Includes the amortization of mortgage servicing rights and additions / recoveries to the valuation allowance of mortgage servicing rights, and is a component of mortgage banking, net in the consolidated statements of income.
Summary of estimated future amortization expense The projections of amortization expense are based on existing asset balances, the current interest rate environment, and prepayment speeds as of December 31, 2018. The actual amortization expense the Corporation recognizes in any given period may be significantly different depending upon acquisition or sale activities, changes in interest rates, prepayment speeds, market conditions, regulatory requirements, and events or circumstances that indicate the carrying amount of an asset may not be recoverable. The following table shows the estimated future amortization expense for amortizing intangible assets:
Estimated Amortization Expense
Core Deposit Intangibles
 
Other Intangibles
 
Mortgage Servicing Rights
 
($ in Thousands)
Year ending December 31,
 
 
 
 
 
2019
$
5,810

 
$
2,824

 
$
9,666

2020
5,810

 
2,707

 
10,355

2021
5,810

 
2,682

 
8,951

2022
5,810

 
2,659

 
7,694

2023
5,810

 
2,640

 
6,580

Beyond 2023
23,724

 
9,551

 
25,187

Total Estimated Amortization Expense
$
52,774

 
$
23,062

 
$
68,433